SMPTE 259M
{{short description|Serial digital interface for video transport}}
SMPTE 259M is a standard published by SMPTE which "describes a 10-bit serial digital interface operating at 143/270/360 Mb/s."{{Cite book | doi = 10.5594/S9781614824077| title = ST 259:2008 : For Television — SDTV1 Digital Signal/Data — Serial Digital Interface| journal = St 259:2008| year = 2008| pages = 1–18| isbn = 978-1-61482-407-7}}
The goal of SMPTE 259M is to define a serial digital interface (based on a coaxial cable), called SDI or SD-SDI.
There are 4 bit rates defined, which are normally used to transfer the following standard video formats:
| class="wikitable"
!Variant !Bit rate !Total lines (per frame) !Active pixels (per line) !Active lines |
| SMPTE 259M-A
|{{no wrap|143 Mbit/s}} |4:3 |525 |768 |486 |59.94i |
| SMPTE 259M-B
|{{no wrap|177 Mbit/s}} |4:3 |625 |948 |576 |50i |
| SMPTE 259M-C
|{{no wrap|270 Mbit/s}} |4:3 or 16:9 |525 |720 |486 |59.94i |
| SMPTE 259M-C
|{{no wrap|270 Mbit/s}} |4:3 or 16:9 |625 |720 |576 |50i |
| SMPTE 259M-D
|{{no wrap|360 Mbit/s}} |16:9 |525 |960 |486 |59.94i |